fun. has announced a summer headlining tour, which the band says could be their last North American leg of touring behind 2012's smash hit album Some Nights. The "Most Nights Summer Tour" kicks off in Toronto on July 6 and wraps up September 26 in Charlottesville, VA. Tegan and Sara will open all dates, touring in support of their new record Heartthrob. fun. is up for multiple Grammys this Sunday night, and will perform live on the 55th Annual Grammy Awards broadcast as well.

This Sunday's Grammys promises an interesting set of performances. Rihanna is joining up with Bruno Mars and 16-time Grammy winner Sting for a group performance. The official Grammys Twitter account revealed, "In case you missed, @BrunoMars @Rihanna + Sting (@OfficialSting) will be performing together at the 55th #Grammys next Sunday,” with no other information on the matter. Kelly Clarkson has also been confirmed as a Grammy performer. Previously announced performances include Justin Timberlake, Alicia Keys, Jack White, Taylor Swift, Elton John, Mumford & Sons, the Black Keys and more. Beyoncé, Hunter Hayes, Jennifer Lopez, Pauley Perrette, and Prince will be presenters. The Grammys will be handed out this Sunday, February 10 on CBS.

Justin Timberlake is not only performing at the Grammy Awards on February 10, but he's also playing another show in Los Angeles that same night. J.T. announced via Twitter that he'll be playing at Los Angeles' Hollywood Palladium on February 10, a show that will be for "fans only." It was also revealed that Timberlake is set to play this year's BRIT Awards in London on February 20. His new album, The 20/20 Experience, is set to drop on March 19, and he is currently working on a video for the single, "Suit & Tie," with director David Fincher. The two also worked together on the movie The Social Network.

Frank Ocean says he will not file any charges against Chris Brown after the two allegedly had a physical altercation in a recording studio parking lot last week. Details of the fight are still a bit unclear, but Ocean wrote on his Tumblr account over the weekend: "As a child I thought if someone jumped me it would result in me murdering or mutilating a man. But as a man, I am not a killer. I'm an artidst and a modern person. I'll chosse sanity. No criminal charges, no civil lawsuit. Forgiveness, albeit difficult, is wisdom. Peace, albeit trite, is what I want in my short life."

Britney Spears hinted about a rumored Las Vegas residency via Twitter, when she took to the social media network under the moniker of her dog. First, Britney's canine Hannah Spears tweeted: "Mommy, are dogs allowed to gamble in vegas? Gonna cash all my bones in for chips." Then Spears responded to the tweet under her own name, where she answered: "I don't think so honey #VivaLasVegas."

For the first time since 2003, Ben Gibbard and Jimmy Tamborello (a.k.a. The Postal Service) have announced a number of headline shows in addition to their two festival appearances at Coachella and Primavera Sound 2013. Gibbard and Tamborello will be reuniting on the road with a band fleshed out by Jenny Lewis (Rilo Kiley, Jenny & Johnny) and Laura Burhenn (Mynabirds). The trek begins on April 9 in Reno and is scheduled to run through June 14 in New York.

Continuing his media blitz in support of the Sound City documentary, Dave Grohl will guest host Chelsea Lately all this week on E! Throughout the week, Grohl will interview Sound City participant Rick Springfield, the legendary Elton John and his friends Tenacious D, among other guests.

Radiohead's Thom Yorke and producer/musician Nigel Godrich have announced a handful of live appearances, which are likely in support of the upcoming Atoms For Peace album Amok. Yorke tweeted, "Me & Nigel out & about with two turntables & a microphone - London 22feb, Berlin 8march, NY 14march. special guests & location to follow.." It is unknown exactly what these live dates will entail, but it appears they will likely be DJ gigs and not concerts.

Muse tie the all-time record on Billboard/Nielsen's Alternative Songs airplay chart, as "Madness' has spent 18 straight weeks at #1. This ties "The Pretender" from Foo Fighters, which spent 18 weeks on top in 2007. "Uprising" from Muse spent 17 weeks at #1 in 2009-2010 as well.

Vampire Weekend has titled their upcoming third album Modern Vampires Of The City. The indie rockers will release the 12-track record on May 7. After playing SXSW in March, Vampire Weekend will head out on a headlining world tour, with a number of dates already announced for April and May.

After Volbeat announced that their upcoming album, Outlaw Gentlemen & Shady Ladies, will be released on April 9, the band has also shared that former Anthrax and The Damned Things guitarist Rob Caggiano has officially joined the band. Caggiano served as producer on Outlaw Gentlemen & Shady Ladies, alongside long-time production partner JacobHansen. Singer and guitarist Michael Poulsen stated, "The band is very proud and happy to announce that he will also be the new guitar player in Volbeat. The collaboration with Rob in the studio was so inspiring and in good spirit that we the decided to keep him. Basically we went into the studio as a three piece and came out as a whole band!" Volbeat will be touring North America with Danko Jones throughout March and April.

John Fogerty will be releasing his duets album Wrote a Song for Everyone on May 28. The new album contains contributions from Foo Fighters, Zac Brown Band, My Morning Jacket, Bob Seger, Jennifer Hudson and Allen Toussaint. His re-recording of the classic Creedence Clearwater Revival song "Born on the Bayou" with Kid Rock was shown last night during Super Bowl XLVII. Fogerty told Rolling Stone about the album last year, "I saw it as a great opportunity to play with some of my favorite musicians."

The Bottle Rock Music & Arts Festival, scheduled for May 10-12 in Napa Valley, California, has announced its full official lineup. It will include big names like Kings of Leon,The Black Keys, Furthur and Zac Brown Band at the top of the bill. Other acts include The Shins, The Flaming Lips, Edward Sharpe and the Magnetic Zeros, The Black Crowes, Jane’s Addiction, Primus, Ben Harper, Cake, The Wallflowers, Bad Religion, Macklemore & Ryan Lewis, and much more. The full bill is available on their website.